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Firstly the lift angle for the 31## calibre family is 52 degrees. I am sure.
Timing tolerances for Rolex movements are based on two criteria.
These criteria are based on timing tests carried out in 5 positions and in two states of winding. Fully wound and 24 hours unwound. (so effectively 10 positions)
The first criteria is the maximum allowable positional variation over the 5 positions in two states of wind, so over 10 positions.
The 5 positions are, dial up, dial down, winding crown down, winding crown left, winding crown up.
The second criteria is the watch's average daily rate. This is calculated by adding the fully wound results and dividing them by 5.
Your results show a very good average daily rate.
2.3+0.8+3.5+4.0-1.9=8.7/5=1.74. So based on your results your watch is showing a daily average rate of +1.74 seconds a day. Well within tolerance.
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